Apple Puck Mouse
Apple shipped the hockey puck-shaped mouse with the iMac G3 in 1998. What in Jobs' name was this supposed to bring the user? This obscenely unusable excuse for a human interface device was one of Apple's most abject creations. It had a single button that was difficult to find without looking and made the experience of 'mousing' totally rubbish -- you didn't know which way it was pointing.
In all fairness, it did have one redeeming innovation -- the puck was the first mouse to use the USB standard as its method of connectivity.
The puck mouse was discontinued around 2000. Good riddance 'n' that.